Teres Major Anatomy: Origin, Insertion & Action

⭐ Teres Major Muscle Anatomy ⭐
💪 Origin: Inferior angle of the medial border of the scapula.
💪 Insertion: Medial crest of the intertubercular groove (also known as the bicipital groove).
💪 Action: Internal rotation of the humerus, extension of the shoulder and adduction of the humerus.
💪 Innervation: Lower subscapular nerve (segmental levels C5 and C6)
💪 Artery: Subscapular and circumflex scapular arteries
The teres major muscle is a thick but somewhat flat muscle which connects the humerus to the scapula. It is one of seven scapulohumeral muscles.
Chapters:
0:00 - Intro
0:17 - Teres major location
0:23 - Origin
0:51 - Insertion
1:18 - Teres major surface anatomy
2:06 - Actions overview
2:40 - Muscle action internal rotation
2:56 - Muscle action shoulder extension
3:16 - Muscle action adduction
3:38 - Outro
3:48 - Teres major origin, insertion & action summary image
⭐ If you would like some help memorising this information, be sure to check out the free muscle study flashcards on bodyworksprime.com
⭐ More details about the teres major muscle can be found at: bodyworksprime.com/teres-major/
#BodyworksPrime #Anatomy #TeresMajor

[@karin11070]

This is the best videos explaining in a clear way covering the important points thanks is helping me a lot

[@BodyworksPrime]

Thanks, that's great to hear! Glad you found it helpful :)

[@shoepebblesquabble]

Man your videos are making studying so much easier ❤️

[@BodyworksPrime]

That's great to hear! I know how challenging studying muscle anatomy can be, so it's great to hear my videos are making it easier for you. Thanks for watching.

[@kigormley]

I found this a very good, thorough, straight to the point presentation. Thanks a lot mate.

[@BodyworksPrime]

Thanks for the feedback Joe! Glad you found it useful.

[@alexjff3018]

Great videos, keep it up! These are helping me a lot as a first-year medical student in the thick of anatomy :)

[@BodyworksPrime]

Thanks for watching! Glad to hear they are helping. Plenty more videos to come 👍

[@user-gu6tg8yu4n]

Thank you so much.

[@BodyworksPrime]

Always welcome, thank you for watching!

[@brawali5797]

Thank you for this amazing video, but please can you explain (why teres major originates from inferior,medial borders (Not lateral) ?)

[@randomguy1578]

This was Amazing 🤩 thanks alot

[@BodyworksPrime]

Glad you liked it! Thanks for watching and commenting. I have a full playlist of these videos if you'd like to see more: ua-cam.com/play/PLxUVHaRHvjIGQXI37wUY5jPcowKCa0t5P.html

[@8garyhouse8]

Well done. Your videos along with Jeff Cavaleri's of Athlean-x lays a good foundation for how the muscles work in weight training

[@BodyworksPrime]

Thank you! Hope your muscle studies are going well

[@TheYemcl]

Looks like a lot more rhomboid, infraspinatus, and teres major movement than a rear delt movement... heck, even the traps and supraspinatus are working as hard as the rear delt is. I'd call this a solid upper back and shoulder workout rather than a rear delt specific movement.

[@CompactedSquid]

Interesting

[@BodyworksPrime]

Glad you found it interesting. Thanks for watching!

[@PersonalPer-it7ds]

Lateral border and inferior angle of scapula....crrect it

[@throxen]

thank you for videos 🙏🏻 what softeare are you using?

[@BodyworksPrime]

The recording software is called 'Action!'. I really like it an the price is reasonable.

[@throxen]

@@BodyworksPrime thank you for anwser, ♥️ i was asking about anatomy software

[@madams989]

Hey thanks for the video. I’m just wondering, I see how having a tight subscap can cause problems with posture due to internal rotation, but could it be advantageous to have tightness with the other rotator cuffs in terms of keeping the shoulders slightly back / externally rotated and the subscap lengthened? Thanks!

[@BodyworksPrime]

Hi Mike, thanks for watching. Due to the rotator cuff muscles being responsible for stabilising the head of the humerus in the glenoid cavity, I wouldn't consider tightness in any of these muscles being advantageous. If any of these muscles are overly tight it could lead to a reduction in the stability of the glenohumeral joint especially at end ranges of motion. Addressing the tight muscles directly using methods such as stretching rather than relying on tight antagonistic muscles is much more beneficial.

[@madams989]

@@BodyworksPrime ok amazing thank you very much

[@dontreadmyname4396]

does it have any importance in scapular upward protraction? i have a bad shoulder, and the teres major on that side is flat compared to the good shoulder side which is clearly visible, i never feel it also when training, what can i do?

[@BodyworksPrime]

If you have a bad shoulder, your brain may have just have altered the mechanics of how you move, resulting in your teres major being under-developed compared to the other side. The main actions of the teres major are: shoulder adduction, shoulder extension and shoulder internal rotation. If you're looking to develop the teres major and it is imbalanced between sides, I would do some single arm lat pulldowns with a somewhat vertical torso angle (as long as it doesn't aggravate your injury). Start with the weaker side first and then do the same amount of reps on your good side after, over time this will bring the muscles up to a similar size. Make sure not to swing the weight, keep it controlled to ensure you're hitting the target muscles. Ideally I would speak with a physiotherapist about it, as they will be able to identify the exact issue.